Detention is the process when a state or private citizen lawfully holds a person by removing his or her freedom of liberty at that time. This can be due to (pending) criminal charges being raised against the individual as part of a prosecution or to protect a person or property. Being detained does not always result in being taken to a particular area (generally called a detention centre), either for interrogation, or as punishment for a crime (see prison).

The term can also be used in reference to the holding of property, for the same reasons. The process of detainment may or may not have been preceded or followed with an arrest. The prisoners in Guantánamo Bay are for example referred to as "detainees".

Detainee is a term used by certain governments and their armed forces to refer to individuals held in custody, such as those it does not classify and treat as either prisoners of war or suspects in criminal cases. It is used to refer to "any person captured or otherwise detained by an armed force."[1] More generally, it is "someone held in custody."[2]

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Any form of imprisonment where a person's freedom of liberty is removed can be classed as detention, although the term is often associated with persons who are being held without warrant or charge before any have been raised. Being detained for the purposes of a drugs search is tantamount to a temporary arrest, as it is not yet known whether charges can be brought against an individual, pending the outcome of the search. The term 'detained' often refers to the immediacy when someone has their liberty deprived, often before an arrest or pre-arrest procedure has yet been followed. For example, a shoplifter being pursued and restrained, but not yet informed he/she is under arrest or read his rights would be classed as 'detained'.

The detention of suspects is the process of keeping a person who has been arrested in a police-cell, remand prison or other detention centre before trial or sentencing.

The length of detention of suspected terrorists, with the justification of taking an action that would aid counter-terrorism, varies according to country or situation, as well as the laws which regulate it.

Under the Obama administration the term enemy combatants was also removed from the lexicon and further defined under the 2010 Defense Omnibus Bill:

Section 948b. Military commissions generally: (a) Purpose-This chapter establishes procedures governing the use of military commissions to try alien unprivileged enemy belligerents for violations of the law of war and other offenses triable by military commission.

Article 9, part 1a of Wetboek van Strafrecht states that there are 4 kinds of primary punishment. Two of them are two kinds of detentions, which are called gevangenisstraf and hechtenis, where the first is a heavier punishment than the second. The two other kinds of punishment is light community service and fines.[4] Prisons are designed in several ways and there are 5 levels of regimes (which depends on the crime committed). Nieuw Vosseveld is a long stay prison with the heaviest regime for the most dangerous criminals. The prison is meant for criminals that have been sentenced to 5 years of imprisonment and longer.